90 lines
2.8 KiB
HTML
90 lines
2.8 KiB
HTML
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<meta content="text/html; charset=utf-8" http-equiv="Content-Type" />
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<title>The BNF from RFC 5321 defining parts of a valid SMTP address</title>
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</head>
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<body>
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<pre style="font-size:11px;">
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Mailbox = Local-part "@" ( Domain / address-literal )
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Local-part = Dot-string / Quoted-string
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; MAY be case-sensitive
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Dot-string = Atom *("." Atom)
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Atom = 1*atext
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Quoted-string = DQUOTE *QcontentSMTP DQUOTE
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QcontentSMTP = qtextSMTP / quoted-pairSMTP
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quoted-pairSMTP = %d92 %d32-126
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; i.e., backslash followed by any ASCII
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; graphic (including itself) or SPace
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qtextSMTP = %d32-33 / %d35-91 / %d93-126
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; i.e., within a quoted string, any
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; ASCII graphic or space is permitted
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; without blackslash-quoting except
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; double-quote and the backslash itself.
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Domain = sub-domain *("." sub-domain)
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sub-domain = Let-dig [Ldh-str]
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Let-dig = ALPHA / DIGIT
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Ldh-str = *( ALPHA / DIGIT / "-" ) Let-dig
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address-literal = "[" ( IPv4-address-literal /
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IPv6-address-literal /
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General-address-literal ) "]"
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; See Section 4.1.3
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IPv4-address-literal = Snum 3("." Snum)
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IPv6-address-literal = "IPv6:" IPv6-addr
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General-address-literal = Standardized-tag ":" 1*dcontent
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Standardized-tag = Ldh-str
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; Standardized-tag MUST be specified in a
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; Standards-Track RFC and registered with IANA
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dcontent = %d33-90 / ; Printable US-ASCII
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%d94-126 ; excl. "[", "\", "]"
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Snum = 1*3DIGIT
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; representing a decimal integer
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; value in the range 0 through 255
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IPv6-addr = IPv6-full / IPv6-comp / IPv6v4-full / IPv6v4-comp
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IPv6-hex = 1*4HEXDIG
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IPv6-full = IPv6-hex 7(":" IPv6-hex)
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IPv6-comp = [IPv6-hex *5(":" IPv6-hex)] "::"
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[IPv6-hex *5(":" IPv6-hex)]
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; The "::" represents at least 2 16-bit groups of
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; zeros. No more than 6 groups in addition to the
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; "::" may be present.
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IPv6v4-full = IPv6-hex 5(":" IPv6-hex) ":" IPv4-address-literal
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IPv6v4-comp = [IPv6-hex *3(":" IPv6-hex)] "::"
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[IPv6-hex *3(":" IPv6-hex) ":"]
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IPv4-address-literal
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; The "::" represents at least 2 16-bit groups of
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; zeros. No more than 4 groups in addition to the
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; "::" and IPv4-address-literal may be present.
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</pre>
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</body>
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</html>
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